Measuring the Profile of a Surface

B

biker6977

#1
How would one go about measuring the noted Profile on the attached PDF?
Thank you,
Caroline
 

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J

JAltmann

#2
Vision system or scanning CMM would probably work pretty good. But the designer forgot the clocking datum. /sigh
 

Stijloor

Staff member
Super Moderator
#5
:(:(:(:(...I give up what is a clocking datum??

Thanks for your help David..

Marty
Marty,

"Clocking" is shop talk for part orientation. For example, a cylindrical symmetrical part with a slot in it may need to be "clocked" (oriented) relative to that slot. The slot will become a possible secondary datum feature for orientation purposes.

I love GD&T...:lol:

Stijloor.
 

optomist1

A Sea of Statistics
Trusted Information Resource
#6
Hi Stijloor,

so the slot or "keyway" may be used to orient a cylindrically symmetric part...like a spline or similar part??

Thanks for your help...

Marty:thanks:
 

Stijloor

Staff member
Super Moderator
#7
Hi Stijloor,

so the slot or "keyway" may be used to orient a cylindrically symmetric part...like a spline or similar part??

Thanks for your help...

Marty:thanks:
Yes for the keyway; a spline is a considered a complex "pattern" and may or may not be called out to orient a part. But your keyway example is a good one! :agree1:

My friend David may want to add to my response..

Stijloor.
 

Stijloor

Staff member
Super Moderator
#9
I'm not sure what is meant by,

There appear to be dimensions referring to the swing point of the radius. Isn't this enough? See attached.
No, not really. The bore of this thing should be the secondary datum feature (establishing a datum axis). The tertiary datum (for "Clocking") should be the slot between the two larger tabs. Datums are developed from physical features that have mating relationships in an assembly.

Stijloor.
 
H

Hodgepodge

#10
No, not really. The bore of this thing should be the secondary datum feature (establishing a datum axis). The tertiary datum (for "Clocking") should be the slot between the two larger tabs. Datums are developed from physical features that have mating relationships in an assembly.

Stijloor.
Why would the bore need to be involved. Datum -B- is the minor diameter of the spline. This establishes a datum axis. The center of the slot between the two larger tabs is the tertiary positioning reference. If the radius was manufactured in the wrong place, more than one of the dimensions relating to it would be out of tolerance. I'm still not sure the print doesn't contain enough information.
 
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